From 61cd8d99e6a3475eaf2bd28bc24892cf1aae0398 Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <matthew@matthewkosarek.xyz>
Date: Tue, 15 Aug 2023 07:29:58 -0400
Subject: WIP on the summer theme

---
 themes/src/shaders/sun_frag.cpp | 51 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 themes/src/shaders/sun_frag.cpp

(limited to 'themes/src/shaders/sun_frag.cpp')

diff --git a/themes/src/shaders/sun_frag.cpp b/themes/src/shaders/sun_frag.cpp
new file mode 100644
index 0000000..d5af4be
--- /dev/null
+++ b/themes/src/shaders/sun_frag.cpp
@@ -0,0 +1,51 @@
+#include "sun_frag.h"
+
+const char* shader_sun_frag = "varying lowp vec4 VertexColor; \n"
+" \n"
+"#ifdef GL_ES \n"
+"precision mediump float; \n"
+"#endif \n"
+" \n"
+"uniform vec2 u_resolution; \n"
+" \n"
+"vec2 skew (vec2 st) { \n"
+"    vec2 r = vec2(0.0); \n"
+"    r.x = 1.1547*st.x; \n"
+"    r.y = st.y+0.5*r.x; \n"
+"    return r; \n"
+"} \n"
+" \n"
+"vec3 simplexGrid (vec2 st) { \n"
+"    vec3 xyz = vec3(0.0); \n"
+" \n"
+"    vec2 p = fract(skew(st)); \n"
+"    if (p.x > p.y) { \n"
+"        xyz.xy = 1.0-vec2(p.x,p.y-p.x); \n"
+"        xyz.z = p.y; \n"
+"    } else { \n"
+"        xyz.yz = 1.0-vec2(p.x-p.y,p.y); \n"
+"        xyz.x = p.x; \n"
+"    } \n"
+" \n"
+"    return fract(xyz); \n"
+"} \n"
+" \n"
+"void main() { \n"
+"    vec2 st = gl_FragCoord.xy/u_resolution.xy; \n"
+"    vec3 color = VertexColor.xyz \n"
+" \n"
+"    // Scale the space to see the grid \n"
+"    st *= 10.; \n"
+" \n"
+"    // Show the 2D grid \n"
+"    color.rg = fract(st); \n"
+" \n"
+"    // Skew the 2D grid \n"
+"    // color.rg = fract(skew(st)); \n"
+" \n"
+"    // Subdivide the grid into to equilateral triangles \n"
+"    // color = simplexGrid(st); \n"
+" \n"
+"    gl_FragColor = vec4(color,1.0); \n"
+"} \n"
+" \n";
-- 
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